package com.atguigu.day07;

import com.atguigu.bean.WaterSensor;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.java.tuple.Tuple;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.KeyedStream;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;
import org.apache.flink.util.OutputTag;

public class Flink02_KeyedState_ValueState {
    public static void main(String[] args) throws Exception {
        //1.获取流的执行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        env.setParallelism(1);

        //2.从端口读取数据,并转为JavaBean,然后将相同的id的数据聚和到一块
        KeyedStream<WaterSensor, Tuple> keyedStream = env.socketTextStream("localhost", 9999)
                .map(new MapFunction<String, WaterSensor>() {
                    @Override
                    public WaterSensor map(String value) throws Exception {
                        String[] split = value.split(",");
                        return new WaterSensor(split[0], Long.parseLong(split[1]), Integer.parseInt(split[2]));
                    }
                })
                .keyBy("id");

        //TODO 3.使用键控状态的valueState处理需求
        //检测传感器的水位线值，如果连续的两个水位线差值超过10，就输出报警。
        keyedStream.process(new KeyedProcessFunction<Tuple, WaterSensor, String>() {
            //TODO 定义一个键控状态用来保存上一次水位
            private ValueState<Integer> valueState;

            @Override
            public void open(Configuration parameters) throws Exception {
                //初始化状态
//                valueState = getRuntimeContext().getState(new ValueStateDescriptor<Integer>("value", Integer.class,0));
                valueState = getRuntimeContext().getState(new ValueStateDescriptor<Integer>("value", Integer.class));
            }

            @Override
            public void processElement(WaterSensor value, Context ctx, Collector<String> out) throws Exception {
                //1.拿当前的水位值和上一次水位进行对比
                Integer lastVc = valueState.value() == null ? value.getVc() : valueState.value();
                if (Math.abs(value.getVc() - lastVc) > 10) {
                    out.collect("水位超过10报警！！！！！！");
                }

                //2.更新状态
                valueState.update(value.getVc());
            }
        }).print();
        env.execute();
    }
}
